Boost update to 1.78.0

[Ryo ONODERA <ryo%tetera.org@localhost>]

Hi,

I have Boost update patch to 1.78.0.

Boost 1.78.0 has one known problem about lang/boost-jam.
It requires some patches.

There is no other significant change.
All packages in pkgsrc/meta-pkgs/bulk-test-boost builds
without problem.

Can I update Boost packages to 1.78.0?

Thank you.